Door stop



FIG. 1 is a perspective view of a door stop showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a left side elevational view; and

FIG. 7 is a bottom plan view thereof.

The ornamental design for a door stop, as shown and described.